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An outbreak of Peste des Petits Ruminants (PPR) was investigated in a goat flock maintained at the Livestock Production and Research Institute (LPRI), Bahadurnagar, Okara, Pakistan. Clinical signs and postmortem findings led to the suspicion of outbreak of PPR. Thirty-five serum samples from affected, recovered and apparently normal animals were tested for the presence of PPR antibodies by competitive ELISA. There was no history of PPR vaccination, however, serum samples from all the recovered and apparently healthy goats were found positive for PPR antibodies. Thirteen of 15 affected goats also had anti-PPR antibodies. However, no PPR antibodies were detected in apparently healthy sheep (n=2) reared in the vicinity of the affected goat herd.